// ------------------------------------------------------------------------
// Copyright 2021 The Dapr Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//     http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------

namespace Dapr.Actors.Communication;

using System;
using System.Runtime.Serialization;

internal class ActorDataContractSurrogate : ISerializationSurrogateProvider
{
    public static readonly ISerializationSurrogateProvider Instance = new ActorDataContractSurrogate();

    public Type GetSurrogateType(Type type)
    {
        if (typeof(IActor).IsAssignableFrom(type))
        {
            return typeof(ActorReference);
        }

        return type;
    }

    public object GetObjectToSerialize(object obj, Type targetType)
    {
        if (obj == null)
        {
            return null;
        }
        else if (obj is IActor)
        {
            return ActorReference.Get(obj);
        }

        return obj;
    }

    public object GetDeserializedObject(object obj, Type targetType)
    {
        if (obj == null)
        {
            return null;
        }
        else if (obj is IActorReference reference && 
                 typeof(IActor).IsAssignableFrom(targetType) &&
                 !typeof(IActorReference).IsAssignableFrom(targetType))
        {
            return reference.Bind(targetType);
        }

        return obj;
    }
}